High-medium-low-voltage integrated power distribution network reliability hybrid calculation method

Abstract

The invention provides a high-medium-low-voltage integrated power distribution network reliability hybrid calculation method. A distribution network integrated model is established by considering themutual influence of a high-voltage distribution network, a medium-voltage distribution network and a low-voltage distribution network, and the method comprises the following steps of: firstly, evaluating the reliability of the high-voltage distribution network based on quasi-sequential Monte Carlo simulation of a state transition sampling method to obtain annual average fault times and annual average power failure time of the high-voltage distribution network; secondly, acquiring a transformer substation outgoing line outage rate and a transformer substation outgoing line repair rate for connecting the high-voltage power distribution network and the medium-voltage power distribution network; and finally, taking the outgoing line outage rate and the repair rate of the transformer substationas the input of reliability calculation of the medium-low voltage distribution network, and calculating the reliability index of the medium-low voltage distribution network by using a minimum path method. The method comprehensively considers the mutual influence between the power distribution networks of high, medium and low voltage levels, improves the accuracy of the evaluation result, relatesto the topology of the low-voltage power distribution network for the evaluation of the power distribution network, and improves the calculation precision of the power supply reliability of a low-voltage user.

Description

technical field [0001] The invention relates to a distribution network reliability evaluation technology, in particular to a reliability hybrid calculation method for high, medium and low voltage integrated distribution networks. Background technique [0002] As the medium connecting users and high-voltage power grid, the distribution network is the most closely connected with users, and it is also the link with the most sensitive perception of users. The reliability evaluation and calculation of it has guiding significance for the planning and transformation of distribution network. Distribution network reliability assessment methods are mainly divided into two categories: analytical method and simulation method. The mathematical model established by the analytical method is relatively accurate, and the evaluation steps are clear, but the calculation is more difficult when the network scale reaches a certain level. In order to improve the computational efficiency and opera...

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Problems solved by technology

[0003] However, the reliability assessment of distribution networks still has the following deficiencies at this stage: First, in the reliability assessment of traditional distribution networks, the distribution network of a certain voltage level is often considered alone without considering its upper or lower networks. As a result, the evaluation results are inaccurate; secondly, the evaluation of the distribution network often does not involve the topology of the low-voltage distribution network, and the reliability of the power supply of the low-voltage users cannot be accurately calculated.

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